Engine sensor test tool, test monitoring system and test monitoring method

Abstract

An engine sensor test monitoring system comprises an engine sensor test tool, a computer, a double-channel traceable signal generator, a double-channel AC / DC amplifier, an environment test box, a current measurement module, a signal processing module, a signal selection control module and a double-channel synchronous acquisition module. Through the system, performance parameters of signals of thecrankshaft position sensor and the cam sensor can be rapidly and efficiently tested and monitored, including signal voltage and supply current inspection, parameters such as signal edge time inspection under various simulation rotating speed conditions, first signal rising edge phase precision of sensor electrification, first signal falling edge phase precision of sensor electrification, signal rising edge phase precision, signal falling edge phase precision and signal rising edge jitter phase precision range distribution, phase precision range distribution of signal falling edge jitter, signal pulse width and pulse number are checked, so that strict and accurate performance test of the engine sensor is realized, and delivery quality is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of engine sensor testing, in particular to an engine sensor testing tool, and specifically relates to a test monitoring system including the above-mentioned engine sensor testing tool and a test monitoring method of the test monitoring system. Background technique [0002] With the rapid development of the automobile industry, there are more and more applications of automotive sensors, among which engine sensors are very critical sensors in automotive engine control systems and automotive safety systems. Engine sensors are mainly divided into crankshaft position sensors and camshaft position sensors according to their positions. , they directly determine the working performance of the engine; therefore, after the production of the crankshaft position sensor and the camshaft sensor is completed, strict and accurate performance tests are required to ensure the quality of the ex-factory products. [000...

AI Technical Summary

Problems solved by technology

[0004] 1. The motor is used to drive or drive the crankshaft gear or cam to rotate. Due to the vibration of the motor, the measurement accuracy is low; the high speed requirement of the motor makes the performance of the motor high and the price is high; at the same time, the motor test structure is complicated and heavy. It is not convenient to carry on-site measurement; the number of crankshaft gears or camshaft gears driven by the motor is small, so that the number of sensors in a single test is small and the efficiency is low. testing and monitoring testing requirements;

[0005] 2. The method of using an oscilloscope to detect the signal of the crankshaft position sensor or cam position sensor has human factors, is prone to fatigue, and cannot efficiently test the performance parameters of the signal of the crankshaft position sensor or cam position sensor, including signal voltage and power supply current inspection. Signal edge time inspection under various analog rotational speeds, the phase accuracy of the first signal rising edge when the sensor is powered on, the phase accuracy of the first signal falling edge when the sensor is powered on, the phase accuracy of the rising edge of the signal, the phase accuracy of the falling edge of the signal, Parameters such as the phase accuracy range distribution of signal rising edge jitter, the phase accuracy range distribution of signal falling edge jitter, signal pulse width and pulse number inspection

The signal parameters of the test process cannot be automatically monitored, recorded, judged, analyzed, etc.;

[0006] 3. The method of generating a periodically changing magnetic field through an AC power supply cannot form an effective rotational excitation magnetic field for a new generation of crankshaft position sensors or cam position sensors containing dual Hall elements, and the crankshaft position sensor or cam position sensor has no signal output. Therefore, it is impossible to carry out rigorous parameter tests such as initial phase difference of signal power-on, signal rising edge phase difference, signal falling edge phase difference, and signal edge jitter phase difference range statistics;

[0007] 4. The method of detecting the mechanical geometric displacement of the crankshaft signal wheel, converting it into a pulse signal, and comparing it with the sensor pulse signal of the sensor signal receiving unit for detection is only a functional detection of the signal pulse count of the crankshaft position sensor. Conduct performance parameter tests

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